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TI-2019-15173 Aliases CVE-2019-25033GHSA-xh42-fcvq-34r9

Unbound before 1.9.5 allows an integer overflow in the regional allocator via the…

Priority MEDIUM 47CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 2 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02368 83rd percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*before 1.9.5VulnerableNLNETLABS
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* Versions before 1.9.5 Vulnerable ·NLNETLABS
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

Red Hat 2 advisories

  • RHSA-2024:0749 Released 2024-02-08 · Red Hat rating Moderate
    unbound security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) python3-unbound-1.7.3-17.el8_6.1, unbound-1.7.3-17.el8_6.1, unbound-devel-1.7.3-17.el8_6.1 +1
  • RHSA-2022:7622 Released 2022-11-08 · Red Hat rating Moderate
    unbound security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) python3-unbound-1.16.2-2.el8, unbound-1.16.2-2.el8, unbound-devel-1.16.2-2.el8 +1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:7622
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2024:0749
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-25033
  2. 2026-10-03 Alias added: GHSA-xh42-fcvq-34r9

References

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences